iOS and Cocos2d - Play sound once in game loop

iOS and Cocos2d - Play sound once in game loop

This is more of a general "best practice" question, so I don't really have
an example. I'm just trying to figure out how people usually approach
this.
Let's say I have a mainGameLoop method, scheduled to be called 60 times a
second. In this method, I have all the logic for the current scene. Now, I
want to play a sound effect using SimpleAudioEngine when a certain state
occurs.
The issue is, once this state occurs, it stays like that for a while,
which means my sound effect will be rapidly played over and over again
until the state changes (after all, we're inside the game loop).
My usually solution for this, is to use booleans to play the effect only
once. Problem is, I am now facing a larger number of different states and
effects, which means quite a lot of booleans.

I was wondering if there's a better way people usually use when playing
sound effects in the game loop.
Any suggestions?